<a href="javascript:;" ng-tap="voltar()">Voltar</a> | <a href="javascript:;" ng-tap="listarEmpresas()">Empresas</a>

<form>
    <button ng-tap="deletar(obra.id)">Deletar</button>
    <label>Nome:</label>
    <input type="text" ng-model="obra.nome" />
    <button ng-tap="editar(obra)">Editar</button>
</form>